Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1456939 | Cement and Concrete Research | 2010 | 9 Pages |
Abstract
The present work aims to use impedance spectroscopy to characterize pozzolanic activity of RHAs prepared on a pilot scale. The method is based on the rate of the normalized conductivity change of the Ca(OH)2Â +Â RHA paste, d(Ï/Ï0)/dt, during the first 24Â h of hydration. The measurement was found to be sensitive to the unburnt carbon content in the 6-8Â wt.% range and the amorphous SiO2 content (regardless of the unburnt carbon content). When used to evaluate two separate groups of RHAs, each with comparable unburnt carbon contents, the method gives very high correlation coefficients to the strength activity index at 3, 7, and 28Â days. However, the correlation coefficients fall significantly when RHAs with vast difference in the unburnt carbon contents are considered together. The method thus proves to be powerful for evaluation of the pozzolanic activity of RHAs with comparable carbon contents.
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Authors
S. Wansom, S. Janjaturaphan, S. Sinthupinyo,